How do I create a contact horizon for use in layered models?

To construct the model including a contact, you will need to construct a version of the contact horizon that is bound by the neighbouring horizons.

Refer to this diagram:

  1. In Map View, open the Operations tab and select Horizon Math.
  2. Add the two bounding horizons ("top" - Top Res, "base" - Base Res).
  3. Set the property of each to TVD (assumes you have a velocity model configured for Time-Depth conversion).
  4. Use this formula to create a constrained constant surface (e.g. at 2500):
    if (top > 2500, top, if (base < 2500, base, 2500))
  5. Set the output Z dimension to TVD.
  6. Click Run.

Rename the result to something useful, e.g. constrainedOWC.

Replace the constant value in your model with this constrained horizon.